NEET BIOLOGY

Detailed explanation-1: -Gastric HCl is secreted from the highly specialized parietal cells located in the corpus of the stomach, generating a H+ concentration in the gastric juice that is 3 million times greater than that in blood and tissue. The process is controlled by a complex system of endocrine cells and neurons.

Detailed explanation-2: -The cephalic phase of digestion is the stage in which the stomach responds to the mere sight, smell, taste, or thought of food. About 20% of total acid secretion occurs before food enters the stomach.

Detailed explanation-3: -Gastric juice contains three substances: hydrochloric acid, enzyme pepsin and mucus. Their functions are: Hydrochloric acid in the stomach is used to make the medium acidic to facilitate the action of the enzyme pepsin and to kill germs if any. Enzyme pepsin digests proteins and converts them into peptones.

Detailed explanation-4: -Gastric juice is made up of water, electrolytes, hydrochloric acid, enzymes, mucus, and intrinsic factor.